A lot of lactic acid is produced inside human organisms after doing sports and physical labor. This makes us feel tired. Citric acid contained in this product gets absorbed directly into the citric acid cycle, which helps control the production of lactic acid. Citric acid derived from starch of sweet potatoes in this product was enforced by vitamins B1, B2, B6 and C, which helps promote the citric acid cycle. Sweeteners such as oligosaccharide and fructose were added to this product. Those who tend to get tired quickly and those who do sports are recommended to take this product to maintain health.